I've done so way back in 2011, actually, but I will have to track down my notes for this. 😶
Since this was 2011, they will need to be rewritten again.
It was when I was running an actual web server box at the time and wanted to use the (empty!) EIDE port on the card. Got the card for cheap and didn't care much then, either.
--
Edit: Found my notes, but I am trying to track down Dell's version of PFLASH, which is version 2.00.0.10, rather than Promise's own version 2.00.0.8. "v10" allows you to back up the flash contents to disk (just in case) whereas "v8" does not. (IIRC, "v10" may seem to flash the Promise BIOS onto that card, somehow.) Also Dell's own packed firmware requires a machine with a floppy disk and drive, and I'm not near either right now. Part of my 2011 notes:
Create a DOS-bootable floppy disk. Then locate PFLASH 2.00.0.10 and run this command:
pflash /s 371bkp.bin
The last retail BIOS version is located on Promise's website as of this writing. The original filename is 371.bin. To flash the new BIOS to the card, simply run this command:
pflash /f 371.bin
Reboot the system. It should properly detect your IDE hard drives along with your SATA hard drives.
--
Edit 2: Did find other later PFLASH versions from other similar Promise cards, 13 and 17; didn't find 10 in Dell's stuff, probably misremembering. (It does exist, however.) Since I just found my own jank TX2"plus" card, I will test these versions at least. Meanwhile, I am archiving their *very* legacy BIOS section. 😏
--
Edit 3: Both work on my card, but 17 is functionally similar to 10, so that will be attached. (13 spits out more detailed info during use.)
--
Edit 4: Found PFLASH v2.00.0.10 in one of Promise's BIOS update packages! I was misremembering. Leaving v2.00.0.17 here for posterity, however.
Site update: cwcyrix.duckdns.org -> cwcyrix.nsupdate.info due to the former no longer working.